Well, Darkmoon, other than the obvious? And the. . . obvious. . . She's just too big for subtle :rolleyes.
Were Sorceress' powers actually accented when she went titan or is she just a really big squishy spellcasting target now, 'cause that flamey thing didn't seem particularly impressive minus the damaging everyone bit and that's kind of expected of a big boss. Isn't it?
We're just getting started, for one. Plus, these are fairly high level heroes.
Also, this is the second form, technically, of a boss they've already been fighting for a while.